No movie universe has shaped young minds or found a place in kids’ hearts like the decades of Disney’s animated adventures. So it’s no surprise that fans have spent time and energy trying to prove that every film connects to those around it, sometimes looking a bit too closely at a random easter egg. With the surprise success of Disney’s Frozen, fans have come up with a theory that is out of this world, claiming another Disney hero is a long lost sibling of the starring sisters. With Disney keeping quiet on any official canon, the theories are all in the name of fun, and using a bit more imagination in between releases. We’ve done our best to lay out the theories that work – and the ones that don’t – in our first Docu Series exploring The Secret Family Relations Between Disney Movie Princesses.